List of top Physics Questions on mechanical properties of solids asked in AMUEEE

Two wires of equal cross section, but one made up of steel and the other copper are joined end to end. When the combination is kept under tension, the elongations in the two wires are found to be equal. If (Y for steel = $2.0\times 10^{11}\,Nm^{-2}$ and $Y for copper = 1.1 \times 10^{11}\,Nm^{-2}$, the ratio of the lengths of the two wires is

If $ S $ is the stress and $ Y $ is the Young?s modulus of material of a wire, the energy stored in the wire per unit volume is